Ævar Arnfjörð Bjarmason [off-list ref] writes:
+test_expect_success POSIXPERM,SYMLINKS 'diff --no-index normalizes: mode not like git mode (symlink)' '
+ ln -s y z &&
+ X_OID=$(git hash-object --stdin <x) &&
+ Z_OID=$(echo -n y | git hash-object --stdin) &&
s/echo -n/printf/
t4053-diff-no-index.sh:185: error: echo with option is not portable
(use printf): Z_OID=$(echo -n y | git hash-object --stdin) &&
gmake[1]: *** [Makefile:95: test-lint-shell-syntax] Error 1
gmake[1]: Leaving directory '/home/jch/w/buildfarm/jch/t'
gmake: *** [Makefile:2855: test] Error 2